1. First download the Kuaiying app from the app store, as shown in the picture.

2. Then open Kuaiying and find the editing function in the creation page, as shown in the figure.

3. Then import the video you shot, as shown in the picture.

4. Click the note mark, click the original sound, and the modulation is minimal, as shown in the picture.

5. Click the note to extract the audio, so that you can extract the background music in the video and complete the rendering.